Arthur Martin F109

Arthur Martin error code F109 indicates: Arthur Martin AOB Series / Pyrolyse Chaleur Tournante Oven: Cavity temperature sensor fault F109; electronic board detects open circuit or shorted PT500 / PT1000 temperature sensor..

The primary root cause for Arthur Martin code F109 is: On Arthur Martin (Arthur Martin AOB Series / Pyrolyse Chaleur Tournante Oven) models: Open platinum thermal sensor element in oven back wall (nominal ~540 Ω for PT500 or ~1080 Ω for PT1000 at 20°C), broken wiring lead, or pinched heat-resistant cable..

To resolve error code F109: Disconnect oven mains. Access rear panel cavity sensor harness. Measure resistance with multimeter (PT500 reads ~540 Ω at 20°C; PT1000 reads ~1080 Ω at 20°C). Hold Départ/Pause and Option buttons firmly for 5 seconds until the red indicator extinguishes and service memory resets.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Arthur Martin code F109 persists, the physical component causing On Arthur Martin (Arthur Martin AOB Series / Pyrolyse Chaleur Tournante Oven) models: Open platinum thermal sensor element in oven back wall (nominal ~540 Ω for PT500 or ~1080 Ω for PT1000 at 20°C), broken wiring lead, or pinched heat-resistant cable. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test NTC Temperature Sensor Probe (Thermistor) across Across sensor pins 1-2 (unplugged harness). Expected nominal reading is 4.8kΩ–12kΩ (at 20°C–25°C). Tolerance: Negative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit..

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.